Nice project! I'm not very strong at note recognition, so I see the “Wrong note” message quite often (which is totally fine), but the frequent blinking feels a bit distracting. You might consider making the feedback a little less visually intense.

Thanks! I see what you're saying - the "Blurred overlay" which says "Sorry Wrote Note!". I could see how that'd be physically jarring after a while.

So you're saying I should add a klaxon? :)

Seriously though - I'll look into a redesign!